Finish remover



' Patented June 30,1931

'UNiTEo s r r-Es PATENT OFFICE JOSEPH G. DAVIDSON, OI YO, NEW YORK, ASSIGNOB '10 CARBIDE AND CARBON cnmnom CORPORATION, A. CORPORATION OF NEW YORK rnnsn: mom

No Drawing.

The invention relates to solvents adapted to remove from wood, metal and other solid materials, films or coatings deposited thereon for ornamentation or protection. Ex-

' amples of such films are those which result from painting, varnishing, lacquering, enameling or waxing. The film usually contains a natural or synthetic gum, resin, wax or oil, or an oxidation product or other derivative thereof, or a cellulose derivative such as-nitrocellulose; and it may contain pigment, dye, or other auxiliary substance. Compositions of the class to which the invention belongs are ordinarily called finish removers or simply paint removers.

The prime requisite in a finish remover is a solvent which will act upon and dissolve a large proportion of the finish filmslikely to be encountered. The utility of the preparation is of course greater the more rapid its solvent action on finishes. In addition the solvent should be reasonably cheap, compatible with auxiliary agents useful in such leaves a'greasy or waxy film on the surface which interferes with the application of a new finish I have discovered that ethers of the glycols and polyglycols have properties which well adapt them for use in finish removers. Their ability to dissolve I finish films is excellent, and they evaporate much less rapidly than the solvents (such .as

i the lower ketones) which have heretofore been most generally used. The residual liquid may be completely removed 'from the surface by wiping and evaporation, and unlike parafline and other waxy evaporation dethe esters of the' Application filed rennin- 2c, 1921. Serial in. 171,884.

terrents leaves no interfering film on the surface. The use of the solvents of my invention makes it unnecessary to use waxes and the like in detrimental proportions. Many 1924, now U. S. Patent No. 1,633,927. Methods suitable for esterifyin these ethers are described in my application Ser. No. 110,286,

filed May 19, 1926.

The boiling oint'of the acetate of the ethyl ether 0 'ethylene glycol is approximately 208 0., while the boiling point of the corresponding compound of triethylene glycol is. about 265 C.

- The type formula for the compounds com- I prised in the invention is ROC E G,H ,.OR

where is an acidyl group, such as CH CO; R is an alkyl or aryl group; n and m are any integers; and the dotted line is a simple bond or a divalent radicle. Thus,' when n=w=1 and the dotted line stands for a simple bond, the formula represents an ester of an ether of ethylene glycol: when n=w=2 and the dotted line stands for -OG2H,O-, the formula represents an ester of an ether of triethylene glycol: and where R stands for CILCO, R stands for C 11,, n 2, a:= 3, and the dotted line stands for 0-, the acetate of the ethyl-ether'of ethylene-propylene glycol is represented. In generalI prefer compounds of the polyglycols and especially esfrom surfaces, the step of disintegrating the coating by attacking an organic constituent thereof by applying thereto a solvent co1 1 taining a compound of the type formula where R is an acidyl group R is an alkyl or aryl group"; n and m are any lntegers; and the dotted line is asimple bond or a divalent radicle.

2. In a process of removing finish coatings from surfaces, the step of disintegrating the coating by attaching an organic constituent thereof by applying thereto a solvent con- 5 taining a compound of the type formula ROC2H4O C;H4OR1 where R is an acidyl group R is an alkyl or aryl group; and the, dotted line is a. simple bOIld OI 0 11 0. Y Y

3. In a process of removing finish coatings from surfaces, the step of disintegrating the coating by attacking anorganic constituent thereof by applying thereto a solvent containing a compound of the type formula --CZH4OR1' where R is an alkyl or aryl group; and the dotted lineis a simple bond or C H O. In testimony whereof, I afiix my signature.

' JOSEPH G. DAVIDSON. 

